Device for stretching wire and wire ropes



0. STUTTGEN.

DEVICE FOR STRETCHING WIRE AND WIRE BO'PES.

Patented Sefit. 19, 1922.,

. APPLICATION FILED MAR. 3|

Patented Sept. 19, i922.

' o'rro STUTTGEN, or rnrnneoe, GERMANY.

DEVICE FOR STRETCHING WIRE AND WIRE ROlES.

To all whom it may concern:

Be it known that I, U'rro Srtir'ronn, a citizen of the German Republic, residing at Futerbog, in the State of Prussia. Germany, have invented certain new and useful improvements in Devices for Stretching Wire and fire Ropes for which I have filed applications in Germany November 1918, D. R. P. No. 318,536, and May 11, 1919, D. R. P. No. 325,060), of which the following is a specification.

This invention relates to devices for stretching wire and wire ropes, of the type in which on a guiding-rod, which at one end carries a hook for its suspension from a fixed point, for instance a pole, a pair of clamping-jaws, which serve for pulling and which close automatically, are slidably arranged by means of a lever-gearing, while a second pair of clamping-jaws, which are immovably located between said suspensionhook and said first pulling pair and which close also automatically, hold the stretched wire fast during the time in which said first pulling pair are disengaged from the wire and are, by means of the lever-gearing, again applied thereto at a point toward the front.

With the known arrangements of this type, the wire to be stretched is held fast by camlike pairs of clamping-jaws and is thus liable to be damaged, when stretched, owing to the strong pressure of the coil paratively short clampingsurfaces.

lVith the arrangement of the present invention, instead of the camlike clampingjaws, so called parallel clamping jaws are used, by which damage to the wire can be avoided. Such parallel clamping-jaws, per se alone, are already used heretofore for stretching wires, as a substitute for the known devils'claws or Dutch tongs with camlike jaws used for the same purpose, and that in connection with pulley-blocks, by which the stretching of the wire takes place, the clamping-jaws being here applied to the wire mostly once only, or, if several times, at large intervals only. With said known parallel jaws, however, a universal step-bystep stretching work, by which the jaws, so-to-say, climb along the wire and catch the same again and again at short intervals, cannot be performed.

The essence of the present invention consists, mainly, in the combination of a lever wire-stretcher with a parallel clamping-- Application filed March 31, 1921. Serial No. 457,549.

claw, so that on the one hand a step-by-.

step work can be performed and on the other hand, contrary to the hitherto used devices the wire is prevented from being damaged when stretched. Thus, it is possible with the improved device to stretch also *ires covered with silk or other sensitive material.

Furthermore, with the hitherto used lever wire-stretchers, it is diii'icult to free the readily stretched Wire, that is still clamped fastwith the ends engaged, from the holding-claw of such lever wire-stretchers, owing to the grip of theclamping-jaws being main tained by the pull of the wire.

To meet this inconvenience, according to the present invention, at the point of attach-- ment of the lever-gearing of the pullingclaw, a turnable abutment-arm is located and made of a. length practically equal to the distance between the pulling-claw in its drawn-out position and the holding-claw, said turnable abutment-arm being turned outwards when stretching the wire.

In order to detach the lever wire-stretcher from the stretched wire, the abutment-arm is turned inwards at the moment when the pulling-claw assumes the position required for pulling the wire, i. e. is advanced for attracting the wire. Thereby, the lever gearing receives'a rest or support on the lower edges of a slide of the holding-claw, on which the clamping-jaws, which are clamped fast on the wire by the pull of the same, are movably arranged. Upon the lever-gearing, and thus also the pullingclaw, being then moved, the jaws of the holding-claw are lifted from the stretched wire.

If such a turnable abutment-arm would be used in connection with lever wire-stretchers having camlike jaws. said abutment-arm must first loosen the jaws clamped fast on the wire before the removal of the jaws becomes possible; consequently, with sensitive wires, this might easily result in. a further damage to the latter.

The accompanying drawing represents a plan View of the improved device.

4 is the guiding-rod having at one end a handle 2' and at the other end a suspensionhook cl. Directly adjacent to said handle, the pulling-claw 7) is arranged. Said claw has parallelly acting clamping-jaws 0, which are connected by pins Z to links m. the latter being mounted by said pins on a slide 0,

'which is movably located on said guidingpress the jaws 0.

rod. Said links on are further pivoted to links 37 connected by bolts 9 to a slide r,

which is also movably located on said guiding-rod.

e is a coil-screw intervening between said slides 0 and 1* and tending to com- The opening of said jaws c, for an insertion and removal of the wire, is effected by the shearlike lever-connection f forming extensions on one side of the links mand p and which remove said jaws from one another until the latter strike on the pulling-claw 7) afore-described and the hand-' lever u, is constructed identically like the pulling-claw Z), with the distinction, however, that, while the slide 1" of the latter is movable on the guiding-rod y, the holdingclaw a has a fixed socket s on said guidingrod, which carries the pivot for said handlever u.

70 is the turnable abutment-arm, the same being mounted on the slide 1- and on the drawing-rod t of the hand-lever u respectively. Said abutment-arm has a length practically equal to the distance between the slide 1" of the pulling-claw Z2 and the lower edge of the slide 0 of the holding-claw ca, when the pulling-claw b is drawn-out by means of the hand-lever gearing u, 6. Upon the abutment-arm 70 being turned to the right for 90, to the position shown, the slide 1", which is connected with the drawing-rod t and the hand-lever a respectively, bears upon the slide 0 of the holding-claw a; and

effects, by operation of said hand-lever u, an opening of the clamping-jaws of the holdingclaw a. Thus, upon stretching of the wire by means of the lever wire-stretcher described being finished and the wire stretched lying clamped fast within the jaws 0 of the holding-claw a, the latter can be easily opened by a pressure on the hand-lever it, provided that the abutment-arm 7c is adjusted in parallel position to the guiding-rod 3 By operation of the lever-gearing u, t, the abutment-arm Z0 is pressed, by the drawing-rod t and the slide 1", upwards toward the slide 0 of the holding-claw a, said slide mov ing thereby upwards and turning, by means of the pins vn, the links m, so that the latter lift the jaws 0 of the holding-claw a.

I claim v A device for stretching wire and wire ropes comprising in combination, a guiding rod, a suspension hook at one end of said guiding rod, an automatically closing pulling claw on said guiding rod, a lever gearmg for moving said pulling claw on said guiding rod, an automatically closing holding claw attached to said guiding rod and located between said suspension hook and said pulling claw and adapted to act as soon as said pulling claw is displaced for a further action, and a pair of parallel acting clamping aws on said pulling claw as well as on said holding claw, substantially as and for the pur pose set forth.

In testimony whereof I afliX my signature in presence of two witnesses.

OTTO STUTTGEN.

Witnesses:

OTTO SHULZE, JAFAMUR KiiHN. 

